Method of making crowns for teeth



(No Model.) 2 Sheets-Sheet 1.

J: J. R. PATRICK.

METHOD OF MAKING GROWNS FOR TEETE.

No. 373,751. Patented Nov. 22, 1887.

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(No Model.) 2 Sheets-Sheet 2. J. J. R. PATRICK METHOD OF MAKING CROWNS FOR TEETH.

No. 873,751. Patented Nov. 22, 1887.

flttorneys UNiTEn STATES PATENT @rrrcn.

JOHN J. It. PATRICK, OF BELLEVILLE, ILLINOIS.

METHOD OF MAKING osowns FOR TEETH.

SPECIFICATION forming part of Letters Patent No. 373,751, dated November 22,1887.

Serial No. 109,640. (No model.)

To all whom 236 may concern:

Be it known that I. JOHN J. R. PATRICK, a citizen of the United States, resident at Belleville, in the county of St. Clair and State of Illinois, have invented a certain new and useful Method of Making Crowns for Teeth; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 of the drawings is a side elevation. Fig. 2 is a front elevation. Fig. 3 is a transverse section. Fig. 4 is a vertical section. Figs. 5, 6, 7, 8, 9,10, 11, and 12 are detail views of various parts; and Fig. 9 is a view of the male die.

The invention relates to improvements in the method of making plate-metal crowns for teeth; and it consists in the hereinafter-described successive steps by which perfect crowns are obtained.

Referring to the drawings by letter, A designates the press or stamp by means of which the crowns are made, A being the base-plate thereof, and A the standard,in the upper end of which the operating-lever isjournaled.

B is the seat for the lower or female dies, secured in the base plate, A, and provided with the upwardly-extending side flanges, B B between which the die-plates travel. The dieplates are provided with longitudinal grooves in the side,into one of which grooves the set-screw B enters to hold the die in po sition when set.

H is the head or tool-holder moving between the walls I I of the press-standard and moved by the lever-handle X, which turns the cam-shaft I. The said shaft is journaled in the walls I I and carries between them the cam K*, which engages in the transverse slot H, which has a central downward extension. The wall I is made detachable to permit the easy insertion of any one particular tool, and is held to the standard by the bolts 1 1 passing through the lugs I and entering the threaded seats I in the wall 1 The head H has a socket into which the upper ends of the different tools are fitted, so that said tools are interchangeable.

H is a set-screw passing through a tapped opening in the head H, and enteringa groove in the shank of the connected tool to keep the same in place.

E is the cutter-plate, by means of which and the cutter-tool P the blanks of the crowns are stamped out of the strip of plate metal.

F is the perforated plate by means of which the body portion of the crown is formed. The perforations Q, in the plate F are of ditl'erent sizes and each is rabbet-ed, as at Q, around its upper orifice. This perforated plate aetsin conjunction with the tool P, having a rounded end, to knock up the flange or body portion (1 of the crown. (See Fig. 12.) The crown is then cup shaped, having its closed end rounded. Theforming-plateGisthensecured in the die-seat B, with one of the openings Gr vertically below the tool secured to the head. The said openings are each irregular in outline, the latter corresponding with the crosssection of a particular tooth, and into said openings the cup-shaped blanks are forced by a tool having a cross-section of the exact size and shape in cross-section of the tooth over which the cap or crown has to be fitted.

J is a plate provided with the recesses J, each of which is made to fit accurately upon a certain tooth, and K is a male or outwardlystanding die corresponding to a certain recess, there being a male die for each recess. The cupshaped crown, alter its cross-section has been shaped by the plate G and the corresponding male die or pnneh,is inserted in the proper recess J, and the corresponding die K set above it in proper relative position to the recess. A hammer, B, is then secured to the head H and brought down on the die K, forming the tubercles or cusps on the metal cup-shaped crown, the latter being shaped between the recess J and the cusped end lit of the die K. The stock from which the plate metal is made must not be greater in thickness than No. 29 nor less than No. 80, American standard gage.

The method thus comprises four steps: first, cutting the disk from the metal strip; second, rounding the edge or making the body-flange of the disk; third, forming the flange or body to lit a tooth in cross-section, and, fourth, forming the cusps or tubercles on the crown; The blank is annealed after being out from the strip and after each separate step in the method. If" the body of the crown should not embrace the male die close enough to be properly formed, a few taps with a light hammer will drive it down and rectify the same.

Having described my invention, I claim-- I The herein described method of making metal crowns for teeth, which method consists in cutting a circular disk or blank from plate stock of a thickness equal to No. 29 or No. 30,

American gage, annealing said disk, knocking up a circumferential or body portion around the edge of the blank, annealing the'blank, rg'

forming the cross-section of the cup-shaped blank to fit the desired tooth, annealing the blank, forming the cusps upon the blank, so as to complete the crown, and annealing the finnished crown, substantially as specified.

In testimony whereof I-affix my signature in presence of two witnesses.

JOHN J. R. PATRICK.

\Vitnesses:

THEO. MUNGEN, PHILIP G. MASI. 

